(NASHVILLE, IN) - A Nashville man has been sentenced to 15 years in prison for participating in an online child pornography conspiracy.

51-year-old Scott Van Dorp and three other men plead guilty in Indianapolis to one count of conspiracy to advertise child pornography, one count of conspiracy to distribute child pornography, two counts of advertising child pornography and two counts of distributing child pornography.

A total of 26 people were charged in the conspiracy.

Four of the 26 remain at large and are known only by their online identities.

Operation Nest Egg, launched in February 2008, targeted about 500 other people throughout the world for their involvement in an online group dedicated to trading images of child pornography.

As a result, more than 50 people have been arrested and 38 have been convicted.